Valve for pneumatic piano-actions and similar devices.



A. J HOBART. VALVE FOR PNEUMATIG PIANO ACTIONS AND SIMILAR DEVICES.

-APPLIGATION FILED IIAY 16, .191 0.

985,033, Patented Feb.21,1911.

Fig.1.

M YEN T03 d UHWEI'B UNITED STATES P rilENT OFFICE.

ADAM J. HOBART, OF ST. JOHNSV ILLE, NEW YORK, ASSIGNORJTO F. ENGELHARIJT & sons, or sf. JOHNSVILLE, NEW YORK.

' VALVE FOR PNEUMATIC PIANO-ACTIONS AND SIMILAR DEVICES.

spcciflcatlon of Letters Patent.

Original application filed January 31, 1910, Serial 1970. 541,019. Divided and this application filed May 16,

1910. Serial No. 561,588.

To all whom it may concern:

lie it known that 1. Ann! J. Honour, a citizen of the linitod States, residing at St. .lohnsville, count of '.\'lont ;o|ne1 y, State of Now York, have invented new and useful Improvements in Valves for Pneumatic Piano- Actions and Similar Devices, of which the following is :1 specification.

This in vvntion relates to a valve of novel titlllsll'llt'llflll for the pneumatic actions of plum: and similar musical instruments, the present application being :1 division of a. prior application filed by me. January 31st, 19H) under Serial Number 541,019.

The valve is of simple construction, effects an air tight closure and not apt to stick to its seat, so that leakage is avoided and a .t'rve play of the valve is insured.

In the accompanying drawing: Figure l is a lcmgitudinal section of my improved valve and cooperating: parts, Fig. 2.:1 cross Foclioll of the valve Fig. 3 a bottom view thereof, and F ig. 4 a longitudinal section of a modification.

In Fig. 1 the invention is shown to be no plied to a primary valve fitted in a valve box lOhaviLg vacuum chamber l1 from which the air is pernnmently withdrawn. duct. 12 con'nnunioates with the tracker bar and when air is admitted into said duct through :1 perforation of the music she t. a

diaphragm13arrunged intermediate vacuum ('lltllll )('l' l1 and duct 12 is raised to correspondingly lift. the primary .valve and thus admit auto'aduct 14. v

The primary valve consists of a longitudinally fluted stem -15 guided in a pair of bushings 16 fitted into a corresponding; bore 17 of block 10, said stein being fitted at its ends into valve-disks 18, 19 cushioned as at, 20. Bushings lti'are preferably provided with flanges 21,- the outer diametersof which are smaller than those ofenshions 20, so that the edges of the latter extend beyond those 0f the former. In this way the frequently, more or less,'-rou; l1ri1ns 01" the cushions do not contact with the, Volvo seats. so that undue leakageis avoided. At its lower (and, stem 15 is provided with a threaded axial socket 15" into which is fitted the screw. stem 22 of a convex button The latter is provided with peripheral notchos 28 for engagement with a suitable gripping tool, so that by turning the button. its distance from valve-disk 19 may be. adjusted. Button 22 rests upon diaphragm 13 secured to the bottom of chamber ll. Below hutton 22, block 10 is provided with a Shallow rocess fll that permits a slight sagging of the diaphragm.

When the invention is applied to a secondary valvqthe valve disks 25, 26 in lieu of being secured to the. ends of valve stem 27 are set back some distance from said ends as illustrated in Fig. 4. The bushings 28 are provided with flanges the outer diameter of which is less than that of the valve dis-lo; as alreadydescribed in relation to Fig. 1. The button 30 is tapped for the eugag'umcnt with the lower threaded end of valve stenril? so that in this way the button may be readily adjusted.

I claim: I

1. A device of the character described. comprising an axially fluted valve stem havinga threaded axial socket, a pair of cushioned disks secured to the ends of said stem. and a notched button in screw threaded engngenu-nt with the stem 'socket.

2. A dovice of the character dcserilmd coni irising a perforated valve box having a vacuum chamber and an air duct. (1 pair of flanged bushings fitted into the box perforations-sun axially fluted stern movable in the bushings. cushioned disks secured to the stern and adapted to engage the bushinglhznges, a diaphragm arranged within the valve box intermediate vacuum chamber and air duct. and a notched button in screw threaded engagement with the stem socket and rusting upon the diaphragm.

' ADAM J HOBART. llnesses:

\V. L. EmELnARnT Grzonon H. HALL. 

